Analisis Kenaikan Debit Banjir akibat Pengaruh Perubahan Tutupan Lahan Menggunakan Google Earth Engine dan HEC-HMS di Sub-Das Petani

Abstract

The Petani Sub-Watershed, located in parts of Karo Regency and Deli Serdang Regency, is a crucial headwater area of the Deli Watershed. This region requires heightened attention due to the potential impacts of land cover changes on hydrological functions, leading to detrimental floods affecting environmental, social, and economic sectors. This study aims to analyze the impact of land cover changes on the increase of flood discharge in the Petani Sub-Watershed using HEC-HMS and Google Earth Engine. The study utilizes land cover scenarios from 2018 and 2023 to map land cover changes. The findings indicate that the conversion of vegetated areas to non-vegetated plays a role in influencing flood peak discharge. For return periods of 5, 10, 25, 50, and 100 years, flood peak discharge increased by 1.752%, 1.46%, 1.235%, 1.103%, and 1.005%, respectively. These results are expected to serve as a reference for flood risk mitigation and the enhancement of effective land cover management in the region